Take journal state lock before reading journal->j_commit_sequence.
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@xxxxxxxxx>
---
fs/jbd2/journal.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index b5fbcd1b444c..f7ebf6ef69af 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -734,10 +734,12 @@ int jbd2_fc_begin_commit(journal_t *journal, tid_t tid)
if (!journal->j_stats.ts_tid)
return -EINVAL;
- if (tid <= journal->j_commit_sequence)
+ write_lock(&journal->j_state_lock);
+ if (tid <= journal->j_commit_sequence) {
+ write_unlock(&journal->j_state_lock);
return -EALREADY;
+ }
- write_lock(&journal->j_state_lock);
if (journal->j_flags & JBD2_FULL_COMMIT_ONGOING ||
(journal->j_flags & JBD2_FAST_COMMIT_ONGOING)) {
DEFINE_WAIT(wait);
--
2.29.1.341.ge80a0c044ae-goog
